what do you use for cutting a hole for the pipe?
With the Car resting on a table, I push the body where the stinger is to mark the spot, then cut up and around with body sissors. Then use a Sanding Drum on a Dremel to clean it up. An Exacto knife blade works great to scrape off the rough edges.
A hole just reamed through the body, always tears out with a couple of hits, or the pipe stinger get coverd by the body and shuts the engine off (DNF).